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CAS RN: 10513-45-8 | Product Number: B0832

N-tert-Butyl-5-methylisoxazolium Perchlorate

Purity: >98.0%(HPLC)(N)
  • Woodward's Reagent L
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Product Number B0832
Purity / Analysis Method >98.0%(HPLC)(N)
Molecular Formula / Molecular Weight C__8H__1__4ClNO__5 = 239.65  
Physical State (20 deg.C) Solid
CAS RN 10513-45-8
Reaxys Registry Number 5202574
PubChem Substance ID 87563816
SDBS (AIST Spectral DB) 10455
MDL Number


Appearance White to Light yellow to Light red powder to crystal
Purity(HPLC) min. 98.0 area%
Purity(with Total Nitrogen) min. 98.0 %
Melting point 119.0 to 122.0 °C
Properties (reference)
Melting Point 119 °C
Pictogram Pictogram
Signal Word Warning
Hazard Statements H272 : May intensify fire
Precautionary Statements P501 : Dispose of contents/ container to an approved waste disposal plant.
P220 : Keep/Store away from clothing/ combustible materials.
P210 : Keep away from heat.
P221 : Take any precaution to avoid mixing with combustibles.
P280 : Wear protective gloves/ eye protection/ face protection.
P370 + P378 : In case of fire: Use dry sand, dry chemical or alcohol-resistant foam to extinguish.
Related Laws:
Fire Defense Law Group-1-III
Transport Information:
UN Number UN1479
Class 5.1
Packing Group III
Woodward’s Reagent L: A Condensing Agent


Experimental procedure1):
Under nitrogen, N-tert-butyl-5-methylisoxazolium perchlorate (240 mg, 1 mmol) is added to a mixture of 3-quinoline carboxylic acid (173 mg, 1 mmol) and triethylamine (140 µL, 1 mmol) in DMF (2 mL). The mixture is stirred at room temperature for 4 h and then poured on iced water (50 mL). The precipitate is collected, washed with water and dried. The intermediate ester 1 (131 mg, 0.44 mmol) is isolated in 44% yield as a yellow powder. Then the product (110 mg, 0.36 mmol) in DMF (3 mL) is added to a freshly prepared guanidine 2 (123 mg, 0.39 mmol) and the mixture is stirred at 140 °C for 2 h. The solvent is evaporated under reduced pressure. Water (10 mL) is added to the residue, and after 12 h at 4 °C, the precipitate formed is filtered, washed with water, and dried to obtain compound 3 in 85% yield.


PubMed Literature


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